Britney Spears is hooked on the real thing.

The rehabbing pop tart has been popping up to a case of Coke every day while at Promises, according to Star. But all that caffeine is making Brit a less than exemplary patient, say Star sources: "She's been very demanding ... refuses to pick up after herself and even asked if she could hire a maid!"

Still, TMZ spoke exclusively yesterday to someone who might be helping Brit through the difficult times – new man-friend, musician Jason Filyaw. "I love her, I support her 100% and we are close," says Filyaw, who's been attending AA meetings with Spears.